| Annabel Louise Pearce | Director | 27 Nov 2013 | 6 Oct 2016 | British | 51 years |
| Brian Michael Bettesworth | Director | 27 Nov 2013 | 15 Feb 2014 | British | 76 years |
| Clive Campbell Holmes | Secretary | 27 Nov 2013 | 21 May 2015 | - | - |
| Clive Campbell Holmes | Director | 27 Nov 2013 | 21 May 2015 | British | 76 years |
| Dean Trevor Smith | Director | 23 May 2014 | 11 Oct 2018 | British | 58 years |
| Eamonn Feeney | Director | 27 Nov 2013 | 30 Sept 2015 | British | 71 years |
| Gwynneth Page | Director | 11 May 2022 | 26 Jul 2023 | British | 52 years |
| James Ross Hiley | Director | 18 Feb 2019 | 3 Feb 2020 | British | 56 years |
| Johann Lesley Robinson | Director | 10 Nov 2015 | 19 Jan 2018 | British | 65 years |
| Michael James Glanville | Director | 14 Dec 2018 | 9 May 2025 | British | 48 years |
| Richard Anthony Broadribb | Director | 9 Nov 2017 | 31 Dec 2023 | British | 56 years |
| Richard John Amesbury-page | Director | 12 Sept 2023 | 31 Aug 2025 | British | 56 years |
| Robert Daniel George Grant | Director | 16 Apr 2018 | 30 Nov 2018 | British | 49 years |
| Simon Peter Welch | Director | 31 Dec 2023 | 26 Apr 2024 | British | 50 years |